optionsfw.cgi: Add default settings for newly added options.

optionsfw.cgi: Add default settings for newly added options.

If no settings for those features can be obtained from the settings
file, set them to the following defaults.

* DROPSPOOFEDMARTIAN -> on (yes)
* DROPHOSTILE -> off (no - because only fresh installed systems should
                     do this)
* LOGDROPCTINVALID -> on (yes)

Signed-off-by: Stefan Schantl <stefan.schantl@ipfire.org>
Reviewed-by: Peter Müller <peter.mueller@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>